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1, 2, 4, 14, 72, 262, 2266, 13582, 78952, 1073318, 6111354, 51512782, 711544290, 7083724494, 53971180750, 497724073414, 12107546905192, 92786772785254, 1022794345965706, 9782774173172782, 237827594204392882, 3191236514753612878, 31668668622796517470
(列表;图表;参考;听;历史;文本;内部格式)
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